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  create table t1 (a int, b text, c int);
  create table t2 (a int, b int, c int);

  insert into t1 VALUES (100, 'false', 1);
  insert into t2 select i,NULL,i from generate_series(1,100000)i;

  explain select * from t1 where (select b from t2) is null;
 ]]>
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                <dxl:OneTimeFilter/>
                <dxl:Assert ErrorCode="P0003">
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                    <dxl:WindowKeyList>
                      <dxl:WindowKey>
                        <dxl:SortingColumnList/>
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                  </dxl:Window>
                </dxl:Assert>
              </dxl:Result>
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          </dxl:Materialize>
        </dxl:NestedLoopJoin>
      </dxl:GatherMotion>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
